HP HP-65 - Keying in Large and Small Numbers

If the decimal points light while the reader/writer motor is run-
ning and then go out, the battery is almost discharged.
Operating the calculator for more than 2 to 5 minutes after this
low power indication first occurs may result in wrong answers.
The battery pack must be replaced or recharged by connecting
the calculator to the battery charger. Be sure to turn off the cal-
culator before connecting the recharger to the calculator.
Also, be sure to start with at least partially charged batteries be-
fore using the card reader/writer.
Keying in Large and Small Numbers
You can key in numbers having power of ten multipliers by
pressing EEX (enter exponent). For example, key in 15.6 trillion
(15.6 X 10%?), and multiply it by 25.
Press See Displayed Comment
15.6 [EBX T
12 R (56x 10+
ENTER4 1.560000000 [EEERIRSTUE
25 % _ Answer
Exact Powers of Ten
You can save time when keying in exact powers of ten by press-
ing [EEX and then pressing the desired power of ten. For example,
key in 1 million (10°) and divide by 52.
Press See Displayed
EEX 6 LHEARES
ENTER TXT
52 % .
To see your answer in scientific notation with 6 decimal places,
Press See Displayed
B3 1.923077
*To key in a negative number (e.g., —15.6 X 10'?) you would press CHS before
pressing EEX .